This is an easy pattern. Circles are easy to crochet in general in simple dc, sc, etc.: just keep increasing groupings one more stitch farther apart for each and every new row and the circle should lay flat even if you keep going like that for forever.
Instructions for three different chainless crochet foundations.
ALOT of FREE crochet patterns on this site. A lot is an understatement! This site is dedicated to all crocheters who have experienced that desperate search for a link you ran across, didn't bookmark and then couldn't find when you wanted it.